Add a simple decorator for local evaluation of functions.
Factor out @local decorator and tests.
Rename test_odin_local -> test_odin.
Refactor names a bit for PEP8.
Add a failing test.

This test requires a decorator that takes multiple arguments and handles scalars.
Generalize local decorator.

It now handles multiple (positional) arguments and multiple types.  I do need to test the values.
Add a failing test (trying to add an ndarray locally).
Add local allclose, check values of tests.

Before I was just checking if they run.
Check computed value in skipped test.

... just for completeness.
Finish abandoned comment.
Add failing kwargs test.
Add test with multiple argument types.
Add support for keyword arguments to decorator.
Factor keying and pushing out of decorator.
Refactor @local decorator.

Combine key_and_push_args and key_and_push_kwargs.
Clean up string-statement buildup.
Refactor @local decorator.

@local no longer takes a context as an argument; a default context is set up when odin is imported.
Fix local_sum test.
Add failing local_none test.
Skip `local_none` test for now.
Rearrange imports, add module comment.